Heel-blank-sawing machine



Aug. 10 1926.

D. o. MARSHALL HEEL BLANK SAWING MACHINE Filed July 25. 1925 w a MA W .7 T 0 ATTORNEYS Patented Aug. 10, 1926.

' UNITED 51"..

TES PATENT OFFICE.

DAVID O. MARSHALL, OF ST. LOUIS, MISSOURI, ASSIGNOR TO MOUND CITY WOOD HEEL & MFG. 00., OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

' HEEL-BLANK-SAWING MACHINE.

Application filed July 23, 1923. Serial No. 653,215.

This invention relates to heel blank sawing machines of the type that comprises a rotatable tubular saw commonly termed a barrel saw.

One object of my invention is to provide a heel blank sawing machine of the general type mentioned which is of such design that the operator in charge of the machine can saw a greater number of heel blanks in,a given time than is possible with other types of heel blank sawing machines now in use.

Another object is to provide a heel blank sawing machine that can be adjusted easily to vary the angle or bevel of the breast face of the blank relatively to the top face of the blank and also to vary the depth of the groove formed in the breast face of the blank.

And still another object is to provide a heel blank sawing machine which is so con-. structed that the foot of the operator .can be used .to move the heel blank into engagement with the saw, thereby leaving the hands of the operator free to pick up a heel blank and hold it in readiness to be positioned in the blank holder of the machine at the completion of the operation of sawing the preceding blank. Other objects and desirable features of my invention will be hereinafter pointed out.

Figure 1 of the drawings is a side elevational view of a heel blank sawing machine constructed in accordance with my invention;

Figure 2 is a front elevational view of said machine;

Figure 3 is a horizontal sectional view taken on the line 3-3 of Figure 1 looking in the direction indicated by the arrows and with the heel blank removed; and

Figure 4 is a perspective view of a heel blank whose breast face or front end has been grooved or curved by my improved machine.

Referring to the drawings which illustrate the preferred form of my invention, A designates a rotatable, tubular sawcom monly termed a barrel saw, which is herein illustrated as being connected to the lower end of a vertically disposed, rotatable shaft B, provided with a pulley O, which is driven by a belt D, and A designates a segmental shaped shield or guard for said saw. The shaft B turns in bearings 1 and 2 carried by a yoke-shaped member E secured to a suitable supporting structure, as shown in Figure 2, and a reciprocating heel blank holder is arranged below the saw A in such a manner that it is adapted to be moved upwardly to cause the saw to form a vertically disposed groove or curved surface w in the front end or breast face of a heel blank y carried by said heel blank holder.

The heel blank holder just referred to can be constructed in various ways without departing from the spirit of my invention,

but in the machine herein illustrated it is formed by a supporting member F on a vertically disposed reciprocating slide Gr that is operatively connected by means of a link 3 with a foot treadle 4, the heel blank being adapted to be positioned on the supporting member F and held securely clamped against said supporting member by an automatic clampin device H, as shown in Figure 1. The sli e is reciprocatingly mounted in a stationary guide member 5 carried by a supporting structure 6 and a stop I is mountedon said supporting structure at'a point directly beneath the saw A so as to act as an abutment for the front end of the heel blank arranged in the heel blank holder. The stop I is arranged in such a position with relation to. the saw A that it always lies intermediate the vertical axis of said saw and the cutting edge e of the saw.v Consequ'entl when'the sli G is moved upwardly by epressin the foot treadle 4:, the heel blank y will e forced upwardly into engagement with the saw, thereby causing the portion of the heel blank that lies within the periphery of the saw to be removed or cut away, thus forming a curved surface a: in the front end or heel breast face of the blank. The slide G is so positioned with felation to the saw A that it will clear "said saw' during the upward movement of said slide, and in the form of my invention herein illustrated, the slide G is made substantially dovetailed sha e in horizontal cross-section, and the gui eway 5 in which it is reciprocatingly mounted is provided at one or both of its sides with shinis or wear strips 7 that can be adjustedby adjusting screws 8 so as to compensate for. wear on the slide or its guideway and thus insure said slide moving in an absolutely straight line or path even after the machine has been in use for an extended period.

The supporting member F on which the heel blank is positioned preparatory to the sawing operation is constructed in such a Way that it can be adjusted so as to vary the angle or bevel of the breast face of the heel blank relatively to the top face of the blank. In the machine herein shown the supporting member F is pivotally connected at 9 to a forwardly projecting lug 10 on the front side of the slide G, and a turn buckle or other adjustable device 11 is provided for supporting the outer end of the member F, said turn buckle being pivotally connected at its upper end to the free end of the member F and being pivotally connected at its lower end to the slide G, as shown in Figure l. Bearing in mind that the stop I acts as an abutment for the front end of the heel blank, it will be obvious that the adjustment of the supporting member F either upwardly" or downwardly varies the angle or bevel of the front end of the blank relatively to the top face of the blank. This adjustment of the supporting member F in connection with the radial adjustment of the stop I makes it possible to produce heel blanks in my improved machine of various forms or shapes. \Vhile the particular construction of the stop I is immaterial, I prefer to equip the machine with a stop having a ver tically disposed portion arranged parallel to the longitudinal axis of the saw A and having a horizontally disposed base portion that is provided with an elongated slot 12 upthrough which a clamping bolt 13 on the stationary supporting structure 6 passes, as shown in Figure 3. In order to center the heel blank with relation to the saw A, the supporting member F is provided wit-h a side guage 14, as shown in Figure 3. that is adapted to be adjusted laterally or transversely with relation to the center line of v the member F.

The automatic work clamping device previously referred to preferably consists of a heel blank engaging device H of any preferred shape connected to the lower end of a vertically disposed rod 15 that projects upwardly through a guide 16 carried by a horizontally disposed arm 17 on the shaft bearing 2. A coiled expansion spring 18 is interposed between the guide 16 and the heel blank engaging device H at the lower end of the rod 15, and a collar 19 is adjustably mounted on said rod at a point above the guide 16 so as to limit the downward movement of the-heel blank engaging device H positioned above the supporting member F. Normally, the device H is positioned above the supporting member F a distance slightly less than the depth of the heel blank, so that when the operator in charge of the machine raises the clamping device H to position a heel blank between same and the supporting member F, the force of the spring 18 exerted on the device H will causethe heel blank to be clamped securely in o Jerative position on the member F. Thereafter when the slide G is moved upwardly to move the heel blank into engagement with the saw A, the spring 18 will compress and the rod 15 will slide upwardly through the guide 16. It will thus be noted that in my improved machine the clamping pressure that is exerted on the heel blank to maintain it in operative position in the heel blank holder is increased automatically and progressively while the saw is passing through the heel blank, thereby virtually eliminating the possibility of the heel blank being knocked out of the holder when it is moved into engagement with the saw or during the sawing operation. The guide 16 is preferably adjustably connected to the su porting arm 17 by a bolt or the like 20, siown in Figure 2, so as to enable the guide 16 to be ad usted horizontally towards and away from the vertical axis of the saw and thus vary the point at which the clamping device H engages the top face of the heel blank, and, if desired, the rear end of the clamping device H may be curved at 21 in such a way that the operation of moving the front end of the heel blank into engagement with said curved surface tends to move the clamping device H upwardly sufliciently to permit the heel blank to be positioned between the de vice H and the supporting member F by a simple forward movement of the blank over the supporting member F, or, in other words,

in a direction towards the stop I. In the machine herein illustrated the bottom face of the clamping device H and a portion of the top face of the supporting member F are serrated so as to increase the gripping action of said parts 011 the heel blank.

In using the above machine the operator first sets the side stop 14 in such a position that the heel blank will be centered proper- 1y with relation to the vertical axis of the saw A. He then raises or lowers the support F by manipulating the turn buckle 11 so as to obtain the desired bevel or angle for the front end of the blank, and thereafter he adjusts the stop I radially with respect to the longitudinal axis of the saw so as to insure that the saw will 'form a groove or curved surface :0 in the front end of the blank beginning at the top face of the blank and terminating at the bottom face. After the machine has been set or adjusted, the heel blank is arranged on the supporting member F in engagement with the side guide depresses the foot treadl'e 4 so as to move the blank upwardly into engagement with the saw, and during the sawing operation the operator picks up an unfinished heel blank so that it will be in readiness to be positioned in the blank holder as soon as the slide G is restored to its normally depressed position and the sawed blank disengaged from the clamping device H. Owing to the fact that the heel blank is moved into engagement with the saw by the foot of the operator, the machine can be operated at a high speed, and, moreover, the work of operating the machine is not fatiguing to the operator as it simply requires a slight downward and upward pressure of the operators foot to move the heel blank into and out of engagement with the saw. In

addition to the fact that the machine is easy to operate and can be operated successfully at a high speed, the various adjustments with which the machine is equipped make it possibleto easily modify the bevel and curvature of the breast face of the heel blank and to adapt the machine to heel blanks of various sizes.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent isz' 1. A machine for curving or grooving the breast face of a heel blank, comprising a rotatable, tubular saw, a supporting member on which the bottom face of the heel blank is adapted to be positioned, a stop arranged at a point intermediate the longitudinal axis and the periphery of the saw and adapted to be engaged by the front end of the blank during the sawing operation, and means for causing the saw to engage the blank and remove the portion of the blank that lies between the said stop and the inner side of the saw.

2. A machine for curving or grooving the breast face of a heel blank, comprising a rotatable, tubular saw, a stop arranged in alignment with said saw and positioned intermediate the longitudinal axis and the periphery of the saw, a member for support ing a heel blank whose front end bears against saidstop, means for movingsaid supporting member longitudinally with relation to said saw and stop so as to cause the saw to remove the portion of the blank in proximity to the stop, and means for enablingsaid stop to be adjusted radially with respect to the longitudinal axis of the saw.

3. A heel blank grooving or curving machine, comprising a vertically disposed barrel saw, means for rotating said saw, a vertically movable slide arranged below said saw at one side of the cutting zone of the saw, an angularly disposed supporting member pivotally mounted on said slide, means for swinging said supporting member on its pivot to change the angle of said member, an adjustable stop arranged in ad vance of the front end of said supporting member so that it will serve as an abutment for the front end of a heel blank positioned on said supporting member, an adjustable side stop on said supporting member for centering the heel blank with relation to the saw, and a spring pressed clamping device for holdin the heel blank in operative position on sai supporting member.

DAVID O. MARSHALL. 

